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// Copyright (C) 2011 The Android Open Source Project
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "update_engine/omaha_response_handler_action.h"
#include <string>
#include <base/logging.h>
#include <base/strings/string_util.h>
#include <policy/device_policy.h>
#include "update_engine/common/constants.h"
#include "update_engine/common/hardware_interface.h"
#include "update_engine/common/prefs_interface.h"
#include "update_engine/common/utils.h"
#include "update_engine/connection_manager_interface.h"
#include "update_engine/omaha_request_params.h"
#include "update_engine/payload_consumer/delta_performer.h"
#include "update_engine/payload_state_interface.h"
using std::string;
namespace chromeos_update_engine {
SystemState* system_state)
: OmahaResponseHandlerAction(system_state,
constants::kOmahaResponseDeadlineFile) {}
SystemState* system_state, const string& deadline_file)
: system_state_(system_state),
deadline_file_(deadline_file) {}
void OmahaResponseHandlerAction::PerformAction() {
ScopedActionCompleter completer(processor_, this);
const OmahaResponse& response = GetInputObject();
if (!response.update_exists) {
got_no_update_response_ = true;
LOG(INFO) << "There are no updates. Aborting.";
// All decisions as to which URL should be used have already been done. So,
// make the current URL as the download URL.
string current_url = system_state_->payload_state()->GetCurrentUrl();
if (current_url.empty()) {
// This shouldn't happen as we should always supply the HTTPS backup URL.
// Handling this anyway, just in case.
LOG(ERROR) << "There are no suitable URLs in the response to use.";
install_plan_.download_url = current_url;
install_plan_.version = response.version;
OmahaRequestParams* const params = system_state_->request_params();
PayloadStateInterface* const payload_state = system_state_->payload_state();
// If we're using p2p to download and there is a local peer, use it.
if (payload_state->GetUsingP2PForDownloading() &&
!payload_state->GetP2PUrl().empty()) {
LOG(INFO) << "Replacing URL " << install_plan_.download_url
<< " with local URL " << payload_state->GetP2PUrl()
<< " since p2p is enabled.";
install_plan_.download_url = payload_state->GetP2PUrl();
// Fill up the other properties based on the response.
install_plan_.payload_size = response.size;
install_plan_.payload_hash = response.hash;
install_plan_.metadata_size = response.metadata_size;
install_plan_.metadata_signature = response.metadata_signature;
install_plan_.public_key_rsa = response.public_key_rsa;
install_plan_.hash_checks_mandatory = AreHashChecksMandatory(response);
install_plan_.is_resume =
DeltaPerformer::CanResumeUpdate(system_state_->prefs(), response.hash);
if (install_plan_.is_resume) {
} else {
LOG_IF(WARNING, !DeltaPerformer::ResetUpdateProgress(
system_state_->prefs(), false))
<< "Unable to reset the update progress.";
LOG_IF(WARNING, !system_state_->prefs()->SetString(
kPrefsUpdateCheckResponseHash, response.hash))
<< "Unable to save the update check response hash.";
install_plan_.payload_type = response.is_delta_payload
? InstallPayloadType::kDelta
: InstallPayloadType::kFull;
install_plan_.source_slot = system_state_->boot_control()->GetCurrentSlot();
install_plan_.target_slot = install_plan_.source_slot == 0 ? 1 : 0;
// The Omaha response doesn't include the channel name for this image, so we
// use the download_channel we used during the request to tag the target slot.
// This will be used in the next boot to know the channel the image was
// downloaded from.
string current_channel_key =
kPrefsChannelOnSlotPrefix + std::to_string(install_plan_.target_slot);
if (params->to_more_stable_channel() && params->is_powerwash_allowed())
install_plan_.powerwash_required = true;
if (HasOutputPipe())
LOG(INFO) << "Using this install plan:";
// Send the deadline data (if any) to Chrome through a file. This is a pretty
// hacky solution but should be OK for now.
// TODO(petkov): Re-architect this to avoid communication through a
// file. Ideally, we would include this information in D-Bus's GetStatus
// method and UpdateStatus signal. A potential issue is that update_engine may
// be unresponsive during an update download.
if (!deadline_file_.empty()) {
chmod(deadline_file_.c_str(), S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
bool OmahaResponseHandlerAction::AreHashChecksMandatory(
const OmahaResponse& response) {
// We sometimes need to waive the hash checks in order to download from
// sources that don't provide hashes, such as dev server.
// At this point UpdateAttempter::IsAnyUpdateSourceAllowed() has already been
// checked, so an unofficial update URL won't get this far unless it's OK to
// use without a hash. Additionally, we want to always waive hash checks on
// unofficial builds (i.e. dev/test images).
// The end result is this:
// * Base image:
// - Official URLs require a hash.
// - Unofficial URLs only get this far if the IsAnyUpdateSourceAllowed()
// devmode/debugd checks pass, in which case the hash is waived.
// * Dev/test image:
// - Any URL is allowed through with no hash checking.
if (!system_state_->request_params()->IsUpdateUrlOfficial() ||
!system_state_->hardware()->IsOfficialBuild()) {
// Still do a hash check if a public key is included.
if (!response.public_key_rsa.empty()) {
// The autoupdate_CatchBadSignatures test checks for this string
// in log-files. Keep in sync.
LOG(INFO) << "Mandating payload hash checks since Omaha Response "
<< "for unofficial build includes public RSA key.";
return true;
} else {
LOG(INFO) << "Waiving payload hash checks for unofficial update URL.";
return false;
// If we're using p2p, |install_plan_.download_url| may contain a
// HTTP URL even if |response.payload_urls| contain only HTTPS URLs.
if (!base::StartsWith(install_plan_.download_url, "https://",
base::CompareCase::INSENSITIVE_ASCII)) {
LOG(INFO) << "Mandating hash checks since download_url is not HTTPS.";
return true;
// TODO(jaysri): VALIDATION: For official builds, we currently waive hash
// checks for HTTPS until we have rolled out at least once and are confident
// nothing breaks. chromium-os:37082 tracks turning this on for HTTPS
// eventually.
// Even if there's a single non-HTTPS URL, make the hash checks as
// mandatory because we could be downloading the payload from any URL later
// on. It's really hard to do book-keeping based on each byte being
// downloaded to see whether we only used HTTPS throughout.
for (size_t i = 0; i < response.payload_urls.size(); i++) {
if (!base::StartsWith(response.payload_urls[i], "https://",
base::CompareCase::INSENSITIVE_ASCII)) {
LOG(INFO) << "Mandating payload hash checks since Omaha response "
<< "contains non-HTTPS URL(s)";
return true;
LOG(INFO) << "Waiving payload hash checks since Omaha response "
<< "only has HTTPS URL(s)";
return false;
} // namespace chromeos_update_engine